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A guy (person, as a non-sexist term) who has a suspiciously quiet rear end. Can also be used as an insult, or general slang term for rear end.
Do you have a dumbutt? (as a question)
What a dumbutt! (as an insult)
Man, my dumbutt is killing me! (as a slang)
Related Words
Someone who is stupid and not doing what they are appose to do
Chase is a dumbutt for drawing on his window while driving.
dumbutt by Guccimaneclassic June 1, 2023

dumbbutt 

can be used as a less offensive term for dumbass; a stupid or dumb person.
You're such a freaking dumbbutt!
dumbbutt by Me_Myself_&I April 21, 2009

dugbutter 

The paste that accumulates between the scroat and the thigh after sever days of performing man activities (i.e. laying around eating taco bell and playing video games, working off a hangover).
Tony reached down to scratch his nuts only to realize that the dugbutter trapping his sac to his leg smelled like a two dollar hooker.
dugbutter by Tony the T-hoe December 15, 2008

Dumbusters 

Special agents whom you're gonna call to catch dumb guys making noise around your neighborhood.
"Hey dude, look at those guys, they're so damn annoying and I do hate them..."
"Let's call the Dumbusters!"
Dumbusters by Swaggatto January 8, 2020

dumpbutt 

When a womans butt is saggy, flat and generally offensive. Such butts are neither round and supple nor has any hope of such glory. Dumpbutts look just as they sound. The cheeks often have a square droop to them as though they had a load of poop in their pants but just kept on going without changing thier pants. Frankly it looks like their butt is a diaper of flesh and cottage cheeze. When a dumpbutt is on the go it looks like their cheeks are flapping because of flatulance.
"My lord, is that a dead animal in her pants or does she have the worst dumpbutt that I have ever seen?!"

"Everyone run, some girl on the the dance floor just broke out the booty dancing and her dumpbutt is pwning everyone wild."

Hey, You! Yeah, the only girl in the room with a Dumpbutt! Yeah you know who you are!
dumpbutt by Lord Grosvenor June 13, 2006